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Simplify 12k+8k+15j-4k+6j-3j
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Put a circle around anything that has a "k" attached to it. Now put a square shape around anything that has a "j" attached to it. Now combine the circles together by adding the 12k and 8k - 4k to get how many "k"'s there are and do the same for the j's. Don't try to put the j's and k's together, they're not the same shape are they?
16k +18j
or 2(8k+9j)
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